UBUNTU-CVE-2026-1965
- Source
- https://ubuntu.com/security/CVE-2026-1965
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1965.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-1965
- Upstream
- Downstream
- Related
- Published
- 2026-03-11T18:00:00Z
- Modified
- 2026-03-19T08:27:48.785757Z
- Severity
-
- 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criterion must first be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. One underlying reason being that Negotiate sometimes authenticates connections and not requests, contrary to how HTTP is designed to work. An application that allows Negotiate authentication to a server (that responds wanting Negotiate) with
user1:password1and then does another operation to the same server also using Negotiate but withuser2:password2(while the previous connection is still alive) - the second request wrongly reused the same connection and since it then sees that the Negotiate negotiation is already made, it just sends the request over that connection thinking it uses the user2 credentials when it is in fact still using the connection authenticated for user1... The set of authentication methods to use is set withCURLOPT_HTTPAUTH. Applications can disable libcurl's reuse of connections and thus mitigate this problem, by using one of the following libcurl options to alter how connections are or are not reused:CURLOPT_FRESH_CONNECT,CURLOPT_MAXCONNECTSandCURLMOPT_MAX_HOST_CONNECTIONS(if using the curl_multi API). - References
Affected packages
Ubuntu:Pro:20.04:LTS / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.25+esm3?arch=source&distro=esm-infra/focal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed7.68.0-1ubuntu2.25+esm3
Affected versions
7.*
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl4",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl4-gnutls-dev",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl4-nss-dev",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
},
{
"binary_name": "libcurl4-openssl-dev",
"binary_version": "7.68.0-1ubuntu2.25+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
Ubuntu:22.04:LTS / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.23?arch=source&distro=jammy
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed7.81.0-1ubuntu1.23
Affected versions
7.*
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl3-gnutls",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl3-nss",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl4",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl4-gnutls-dev",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl4-nss-dev",
"binary_version": "7.81.0-1ubuntu1.23"
},
{
"binary_name": "libcurl4-openssl-dev",
"binary_version": "7.81.0-1ubuntu1.23"
}
],
"availability": "No subscription required"
}
Ubuntu:24.04:LTS / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.8?arch=source&distro=noble
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed8.5.0-2ubuntu10.8
Affected versions
8.*
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl4-gnutls-dev",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl4-openssl-dev",
"binary_version": "8.5.0-2ubuntu10.8"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.5.0-2ubuntu10.8"
}
],
"availability": "No subscription required"
}
Ubuntu:25.10 / curl
Package
- Name
- curl
- Purl
- pkg:deb/ubuntu/curl@8.14.1-2ubuntu1.2?arch=source&distro=questing
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed8.14.1-2ubuntu1.2
Affected versions
8.*
Ecosystem specific
{
"binaries": [
{
"binary_name": "curl",
"binary_version": "8.14.1-2ubuntu1.2"
},
{
"binary_name": "libcurl3t64-gnutls",
"binary_version": "8.14.1-2ubuntu1.2"
},
{
"binary_name": "libcurl4-gnutls-dev",
"binary_version": "8.14.1-2ubuntu1.2"
},
{
"binary_name": "libcurl4-openssl-dev",
"binary_version": "8.14.1-2ubuntu1.2"
},
{
"binary_name": "libcurl4t64",
"binary_version": "8.14.1-2ubuntu1.2"
}
],
"availability": "No subscription required"
}